.background {
    width: 100%;
    /* 固定位置 脱离标准流 */
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    background-size: cover;
    display: flex;
    overflow: hidden;
    z-index: -1;
}

.background {
    background-image: url(../../../img/login/background.jpg);
}

.masking {
    width: 100%;
    height: 100%;
    /* 蒙版 */
    backdrop-filter: blur(5px);
}